What is the air quality trend in Onomichi?

Over the past 8 days, Onomichi had an average AQI of 46 based on station measurements. The worst day was 2026-10-14 with AQI 59.

How is Onomichi air quality measured?

Air quality in Onomichi is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Onomichi, Japan

Name: Onomichi Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Onomichi, Japan.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 17 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	32	25–41	7.7 µg/m³	12.4	10h	18
2026-10-20	51	24–170	14.5 µg/m³	32.6	24h	16
2026-10-19	45	30–90	11.5 µg/m³	16.5	24h	16
2026-10-18	37	26–47	8.8 µg/m³	16.3	24h	18
2026-10-17	46	34–69	11.3 µg/m³	13.3	24h	16
2026-10-16	56	40–113	15.3 µg/m³	15.4	24h	13
2026-10-15	47	29–118	12.4 µg/m³	12.5	24h	15
2026-10-14	59	30–119	17.3 µg/m³	8.0	12h	14

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